Cats are the boss?

I know cats have an attitude, but are the really the boss? Sometimes they are, like today.
After the evening walk, Jessica and I brought Jiba and Shunka home and I wanted to take a drink. But I wasn’t allowed by Rifki, one of the cats living there. He sat by the drinking bowl and slowly drank water. And I wasn’t allowed to drink until he was finished or he started hissing. So I just listened to him, because I didn’t wanted to get a cat slap.